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A pond was located near a tube-tyre repa...

A pond was located near a tube-tyre repariing shop. A group of class IX students persent near the pond for a picnic noticed one of their Classmate Rohit falling in the pond. Rhoit started screaming for help. The topper of the class Rajesh immeditely responded. He rushed to the tube-tyre repairing shop and rbought an inflated tube and threw it towards Rohit. Rohit got hold of that tube and was saved.
What is the principle of physics that Rajesh had in his mind ? State the principle.

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MODERN PUBLICATION-FLOATING BODIES-EXERCISE
  1. A pond was located near a tube-tyre repariing shop. A group of class I...

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  2. What is the force acting perpendicular to the surface of an object cal...

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  3. What is the S.I unit of thrust?

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  4. (Thrust)/(Area) =

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  5. The S.I unit of presure is pascal (Pa) or Nm^-2. (T or F)

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  6. Is pascal big unit or a small unit for practical usage?

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  7. Thrust is a quantity.(scalar/vector)

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  8. Why is the needle end of an injection sharp?

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  9. Pressure is a vector quantity. (T or F)

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  10. Give two applications where is beneficial high pressure

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  11. Give two applications where is beneficial low pressure

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  12. A force of 200 N acts on an area of 1cm^2 uniformly . Find the pressur...

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  13. A uniform cube of edge length 5 cm and mass 5 kg is kept on a table to...

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  14. A girl of weight 40 kgf is wearing sandal with head of area 2cm^2. Fin...

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  15. Calculate the greatest and the least pressure exerted by a metal block...

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  16. The atmosphere pressure at a place isw 10^5 Pa. What thrust does it ex...

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  17. A block of wood is kept on the table top. The mass of wooden block is ...

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  18. A block of wood is kept on the table top. The mass of wooden block is ...

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  19. In what direction does the buoyant force on an object immersed in a li...

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  20. When a partially floating body is pressed down a little, its weight, w...

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  21. When a partially floating body is pressed down a little, its its upthr...

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